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Hollow microsphere core-shell structure wave-absorbing material as well as preparation method and application thereof

A core-shell structure and wave-absorbing material technology, applied in chemical instruments and methods, other chemical processes, electrical components, etc., can solve problems such as poor impedance matching, difficulty in attenuating and consuming electromagnetic waves, and achieve the effect of reducing electromagnetic waves

Pending Publication Date: 2021-01-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Fe 3 o 4 Good magnetic properties make it possible to attenuate electromagnetic waves through magnetic loss, but it is difficult to achieve good impedance matching and efficient microwave attenuation at the same time only by relying on a single loss mechanism of a single material, Fe 3 o 4 Due to the poor impedance matching of materials, it is difficult to completely attenuate and dissipate electromagnetic waves

Method used

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  • Hollow microsphere core-shell structure wave-absorbing material as well as preparation method and application thereof
  • Hollow microsphere core-shell structure wave-absorbing material as well as preparation method and application thereof
  • Hollow microsphere core-shell structure wave-absorbing material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Weigh 45mL of ethylene glycol, add 1.1g FeCl to it 3 ·6H 2 0, 2g polyvinylpyrrolidone (PVP) and 4g urea, the mixed solution is placed on a magnetic stirrer and stirred to transparency, then ultrasonically homogenized; the gained solution is transferred to a reaction kettle lined with polytetrafluoroethylene, Place it in an electric blower box and heat it to 200°C, keep the temperature constant for 30h, then cool it down to room temperature naturally to get Fe 3 o 4 hollow microspheres.

[0057] (2) 0.68g Zn(Ac) 2 2H 2 O and 0.1 g of Fe prepared in step (1) 3 o 4 The hollow microspheres were added to 100 mL of absolute ethanol; then 25 mL of alcohol solution containing 0.25 g of NaOH was added dropwise in a water bath at 60 °C. After the dropwise addition, the mixture was mechanically stirred for 4 hours, and the obtained product was separated from the solvent with a magnet, washed with absolute ethanol and deionized water several times, and dried. Get ZnO co...

Embodiment 2

[0062] Compared with Example 1, the heating time in step (1) is 36h, and other conditions remain unchanged. get Fe 3 o 4 hollow microspheres.

[0063] The operation of step (2) is identical with embodiment 1, obtains ZnO coating Fe 3 o 4 Hollow microsphere core-shell structure material.

Embodiment 3

[0065] Compared with Example 1, the amount of urea in step (1) is changed to 6g, and other conditions remain unchanged. get Fe 3 o 4 hollow microspheres. Step (2) is identical with embodiment 1.

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Abstract

The invention relates to a wave-absorbing material with a hollow microsphere core-shell structure as well as a preparation method and an application of the wave-absorbing material. The material comprises Fe3O4 hollow microspheres and ZnO, the outer surfaces of the Fe3O4 hollow microspheres are coated with the ZnO, and the Fe3O4 hollow microspheres are of a hollow porous structure. According to theinvention, FeCl3. 6H2O, polyvinylpyrrolidone (PVP), urea and ethylene glycol are used as raw materials, and the Fe3O4 hollow microspheres are prepared by adopting a hydrothermal method; Zn(Ac)2.2H2Oand absolute ethyl alcohol are mixed with the hollow microspheres, and a mixture is reacted in an alkaline environment to obtain the ZnO-coated Fe3O4 hollow core-shell microsphere wave-absorbing material. The wave-absorbing material has good wave-absorbing performance and has certain loss to electromagnetic waves of various wave bands.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and in particular relates to a hollow microsphere core-shell structure absorbing material and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In the information age, electromagnetic pollution caused by electromagnetic waves with electromagnetic radiation characteristics such as radio waves, microwaves, infrared rays, and ultraviolet rays has become one of the most serious pollution problems in the world. Excessive electromagnetic radiation can cause abnormal operation of communication systems and precision instruments, an...

Claims

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Application Information

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IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 刘久荣郑司南刘伟王凤龙汪宙吴莉莉
Owner SHANDONG UNIV
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